refactor: migrate to official nextra i18n and native navigation

pages/en/developer/_meta.json

@@ -0,0 +1,4 @@
+{
+    "index": "Overview",
+    "endpoints": "Endpoints"
+}

pages/en/developer/endpoints.mdx

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+# Endpoints
+
+## Certificates
+
+### List Certificates
+`GET /certificates`
+
+### Request Certificate
+`POST /certificates`
+
+```json
+{
+  "csr": "-----BEGIN CERTIFICATE REQUEST-----...",
+  "validity_days": 365
+}
+```

pages/en/developer/index.mdx

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+# Developer API
+
+Welcome to the TrustLab API documentation.
+You can use our REST API to automate certificate issuance, revocation, and retrieval for your internal services.
+
+## Base URL
+
+```http
+https://trustlab.dyzulk.com/api/v1
+```
+
+## Authentication
+
+All API requests must include your API Key in the `Authorization` header.
+
+```bash
+Authorization: Bearer <YOUR_API_KEY>
+```